CN101826941B - The feedback method of channel quantitative information and device - Google Patents

Abstract

The invention discloses a kind of feedback method and device of channel quantitative information, wherein, method comprises: receiving terminal uses channel related information to carry out process to the first code book and obtains the second code book; The indication information corresponding with the code word in the second code book is sent to transmitting terminal; Wherein, the vector that in the first code book, front X element of each code word is formed is different, and the element in code word meets 8PSK or 16PSK characteristic, n _tfor the number of transmit antennas of transmitting terminal, for the operator that rounds up.Present invention decreases code book C _bin the similarity degree of code word, increase code word distance between any two, improve quantitative efficiency.

Description

The feedback method of channel quantitative information and device

Technical field

The present invention relates to the communications field, in particular to a kind of feedback method and device of channel quantitative information.

Background technology

In a wireless communication system, if transmitting terminal and receiving terminal all use many antennas, the mode of spatial reuse can be taked obtain higher speed.Relative to general method for spacial multiplex, a kind of technology of enhancing is that receiving terminal feeds back to transmitting terminal channel information, and transmitting terminal uses some to launch precoding technique according to the channel information obtained, and greatly can improve transmission performance like this.Simple Application way directly uses channel characteristics Vector Message to carry out precoding, and it is mainly used in, in Single User MIMO (multiple-input and multiple-output), also has some other more excellent but more complicated method, be mainly used in multiuser MIMO.But these methods all need channel information more accurately.

In Long Term Evolution plan (LongTermEvolution, LTE), the feedback of channel information mainly utilizes better simply single code book feedback method, and the performance of the transmitting precoding technique of MIMO depends on the accuracy of wherein code book feedback.The general principle that channel information based on code book quantizes feedback is: suppose that Limited Feedback channel capacity is Bbps/Hz, so can the number of code word be N=2 ^bindividual.The space of feature vectors of channel matrix is through quantizing to form codebook space this code book (sending and receiving end is identical) is preserved or produced in real time to transmitting terminal and receiving terminal jointly.H is realized to every secondary channel, receiving terminal according to certain criterion from middle selection code word of mating most with channel and code word sequence number i is fed back to transmitting terminal.Here, code word sequence is known as PMI (PrecodingMatrixIndicator, pre-coding matrix indication information).Transmitting terminal finds corresponding pre-encoding codeword according to this sequence number i thus acquisition channel information, illustrate the characteristic vector information of channel.

In general can be divided into the code book that multiple Rank (layer) is corresponding further, under each Rank, the corresponding multiple code word of meeting quantizes the pre-coding matrix that this Rank lower channel characteristic vector is formed.Due to the Rank and non-zero characteristics vector number etc. of channel, therefore, code word when in general Rank is N all can have N to arrange.So, code book multiple sub-codebook can be divided into by the difference of Rank, as shown in table 1.

Table 1

Wherein, need the code word stored be all matrix form when Rank > 1, such as, code book in LTE protocol is exactly the feedback method of this codebook quantification of employing, and as shown in table 2 is the precoding codebook of descending 4 antennas.Hereinafter, for the purpose of unification, vector also can regard one as has a dimension to be the matrix of 1.

Table 2

In table 2, i is unit battle array, W _k ^{{ j}}representing matrix W _kjth column vector, representing matrix W _kjth ₁, j ₂..., j _nthe matrix that row are formed.

As the advanced long-term evolution system (LongTermEvolutionAdvanced of the continuation evolution of LTE, LTE-A) owing to needing to support larger system bandwidth (reaching as high as 100MHz), and need the spectrum efficiency improving average spectral efficiency (ase) and Cell Edge User, therefore, LTE-A needs to strengthen some technology, as improved feedback efficiency, improve the precision of code book feedback further.Based on the demand of LTE-A, the thought of adaptive codebook is suggested.The main thought of adaptive codebook utilizes channel related information to code book C _badjust, the code book C then after Use Adjustment _bchannel characteristic information is quantized.Its advantage is that it effectively can improve the precision of code book feedback under correlated channels scene, and then the spectrum efficiency of channel is effectively improved.Here channel related information is the information of a long-time statistical, feeds back with therefore needing long period.

Relevant its form of adaptive codebook technology can be expressed as: C _b=F (R, C _b), namely utilize the one of channel related information concrete form: " channel correlation matrix R ", and a function F is to a code book C _badjust, obtain the code book C adapting to the distribution of current channel characteristics vector _b.

Concrete, adaptive codebook C _bfollowing mathematical form can be described as:

C _b=RC _b/ norm (RC _b) or here utilize channel correlation matrix R or R function f (R) to code book C _bdo rotary manipulation (premultiplication or the right side are taken advantage of), then C is obtained to code word normalizeds all in the code book obtained _b.Channel correlation matrix R is generally a N _t× N _thermitian matrix, can by H ^hh long-time statistical on average obtains.H is the channel matrix formed between dual-mode antenna. general employing Cholesky decomposes or feature decomposition defines.That is: Cholesky decomposes definition: with it is all triangular matrix.Feature decomposition defines: or the wherein unitary matrice of V representation feature vector composition, the diagonal matrix of ∑ representation feature value composition.

In fact, the physical meaning of adaptive codebook can be understood as: because channel exists correlation, so characteristic vector is not equally distributed in the total space, but probability distribution density is larger around characteristic value characteristic of correspondence vector larger after R feature decomposition, therefore, utilize the correlation matrix R of channel or R function f (R) to an original code book C _bc can be made after carrying out rotary manipulation (premultiplication or the right side are taken advantage of) _bcode word more in the region number of codewords that characteristic vector distribution density is larger.

More specifically, R has N number of characteristic vector V ₁~ V _n, character pair value λ respectively ₁~ λ _n, namely a kind of form RC in existing adaptive codebook technology _bcan be understood as:

Step 1, code book C _bin code word to each characteristic vector V of R _nprojection;

Step 2, the projection components V ' obtained ₁~ V ' _nbe multiplied by weights (i.e. eigenvalue λ respectively ₁~ λ _n) sue for peace afterwards;

Step 3, obtains C to the operation that the vector after summation is normalized _bin code word.

Now, if each eigenvalue λ in R ₁~ λ _nunequal, after projection, the vector of synthesis is close to large characteristic value characteristic of correspondence vector, away from the vector that little characteristic value is corresponding.

Adopt adaptive code instinct according to channel related information, obtain the distribution situation of characteristic vector, then rotate the distribution that all code words carry out meeting market's demand vector, very effectively can improve quantified precision, good performance can be obtained under correlated channels.

In lte-a system, in dependent adaptive codebook techniques, namely the most simple and effective application mode rotates the code word of original 4Tx (4 transmitting antenna) fixed codebook.

Inventor finds, because code word in LTE system has the characteristic of the permanent mould of element, namely the modulus value of each element is equal, and is all the element that 8PSK letter is concentrated, and now there will be following problem:

Due to LTE code book when designing it is considered that the distance of 4 n dimensional vector ns of entirety is even, namely the similarity degree of 4 n dimensional vector ns is less, but does not consider wherein the 1st, and 2 elements form the similarity degree of 2 n dimensional vector ns, so have the 1st of more code word the, the two-dimensional vector of 2 element formations is equal.And after by channel related information effect, the similarity degree of the 1st, 2 elements determines the similarity degree being applied rear code word largely.Therefore, had in postrotational code word some code words distance between any two (distance can with string apart from weigh) always very little, sometimes even occur string apart from level off to 0 situation.Because string is apart from very little or be 0, in fact these code words are the equal of code word of equal value, that is use one of them just can obtain the identical effect of the multiple code word of use.Therefore, cause the unnecessary waste of some code words in code book, thus cause quantitative efficiency lower.

Code book C in correlation technique _bin some code words distance between any two very little or be 0, and in this embodiment, code book C _bbefore in each code word in (i.e. the first code book) (N _tfor antenna number) vector that forms of individual element is different, thus make the code book C after by channel related information process effect _bthe similarity degree of the code word in (i.e. the second code book) reduces, and code word distance between any two increases, and solves the code book C of correlation technique _bin the unnecessary waste of some code words, the problem that quantitative efficiency is lower, this embodiment reduces code book C _bin the similarity degree of code word, increase code word distance between any two, improve quantitative efficiency.

Wherein, meet 8PSK characteristic or 16PSK characteristic, namely all elements wherein such as vector, matrix, code word is all the element that 8PSK or 16PSK letter is concentrated.

(1) as antenna number N _twhen being 4, receiving terminal is based on codebook mode feedback channel quantitative information to transmitting terminal, and that the PMI information wherein fed back indicates is code book C _bin code word, this code book C _bto code book C by channel related information _bobtain after process.

Wherein, above-mentioned code book C _bin code word can comprise K 4 n dimensional vector ns, the element that this K 4 n dimensional vector n are concentrated by 16PSK letter is formed, and the two-dimensional vector of the 1st of this K vector the element and the 2nd element formation is different; Wherein, K is 2 ^b, B is nonnegative integer.

Preferably, above-mentioned code book C _bcan also comprise individual 4 n dimensional vector ns of K, this K 4 n dimensional vector ns are made up of the element that 8PSK letter is concentrated, and the two-dimensional vector of the 1st element of this K 4 n dimensional vector ns and the 2nd element formation is different; Wherein, K is 2 ^b, B is nonnegative integer.The element that 8PSK letter is concentrated is the element of the code word in conventional formation code book, uses these elements to form the code book C meeting the requirement of this preferred embodiment _bin code word, can practical application be more suitable for.

Preferably, above-mentioned code book C _bcan also be the code book that the partial codeword vector in Rank1 code book in LTE system (i.e. layer 1 code book) is formed, and 2 n dimensional vector ns of the 1st of each codeword vector the element and the 2nd element formation be different.The code word in the code book in correlation technique can be utilized to form satisfactory code book C _b.

Preferably, above-mentioned code book C _bcan also be: W ₄ ^{{ 1}}, W ₅ ^{{ 1}}, W ₆ ^{{ 1}}, W ₇ ^{{ 1}}, the code book that forms of a vector in A1 set, a vector in A2 set, vector in a vector in A3 set and A4 set; Wherein, A1 set is { W ₀ ^{{ 1}}w ₈ ^{{ 1}}w ₁₂ ^{{ 1}}w ₁₃ ^{{ 1}}, A2 set is { W ₁ ^{{ 1}}w ₉ ^{{ 1}}, A3 set is { W ₂ ^{{ 1}}w ₁₀ ^{{ 1}}w ₁₄ ^{{ 1}}w ₁₅ ^{{ 1}}, A4 set is { W ₃ ^{{ 1}}w ₁₁ ^{{ 1}}, i is unit matrix, u _nbased on vector, n=0,1 ..., 15.U _nconcrete value can see table 2.Comparatively conventional vector can be used to form satisfactory code book C _b, thus make more to be applicable to actual use.

Preferably, above-mentioned code book C _bcan also comprise M vector, this M vector is selected from by W ₄ ^{{ 1}}, W ₅ ^{{ 1}}, W ₆ ^{{ 1}}, W ₇ ^{{ 1}}, a vector in above-mentioned A1 set, above-mentioned A2 gather in a vector, above-mentioned A3 gather in a vector and above-mentioned A4 gather in the set of vectors of a vector composition, wherein 0 < M < 8.Comparatively conventional vector can be used to form satisfactory code book C _b, thus make more to be applicable to actual use.

Above-mentioned channel related information can be a N _t× N _tmatrix, further can refer to channel correlation matrix R or to code book C _bthe process operation carried out can be linear or nonlinear function process, and this function can be expressed as F (R, C _b), F is a function.Above-mentioned channel related information also can be obtained by multiple matrix operation.As on: polarization dependence matrix and same polarised direction root antenna related matrix carries out that Kronecker is long-pending to be obtained, or eigenvalue matrix takes advantage of feature matrix to obtain.

After PMI information is sent to transmitting terminal by receiving terminal, transmitting terminal according to this PMI information from code book C _bmiddle acquisition channel quantitative information, and use this channel quantitative information to carry out transmitting precoding.

Above-mentioned 8PSK letter collection is

Above-mentioned 16PSK letter collection is lower same.

(2) as antenna number N _twhen being 8, receiving terminal is based on this transmitting terminal of code book feedback channel quantitative information, and that the PMI information wherein fed back indicates is code book C _bin code word, this code book C _bto code book C by channel related information _bobtain after process.

Wherein, above-mentioned code book C _bin code word can comprise K 8 n dimensional vector ns, the element that this K 8 n dimensional vector n are concentrated by 16PSK letter is formed, and the 1st, 2,3 of this K 8 n dimensional vector ns, and the four-vector that 4 elements are formed is different; Wherein, K is 2 ^b, B is nonnegative integer.The element that 16PSK letter is concentrated is the element of the code word in conventional formation code book, uses these elements to form code book C _bin code word, can practical application be more suitable for.

Above-mentioned channel related information can be a N _t× N _tmatrix, particularly, above-mentioned channel related information can refer to the R of channel correlation matrix R or the statement of multiple matrix form, to code book C _bthe process operation carried out can be linear or nonlinear function process F (R, C _b), F is a function.Channel correlation matrix R can also be further a matrix in block form.

The element that letter is concentrated is the element of the code word in conventional formation code book, uses these elements to form code book C _bin code word, can practical application be more suitable for.

Preferably, above-mentioned code book C _bcan comprise K 8 n dimensional vector ns, this K 8 n dimensional vector ns are made up of the element that 16PSK letter is concentrated, and the trivector that the 1st, 2,3 elements of this K 8 n dimensional vector ns are formed is different; Wherein, K is 2 ^b, B is nonnegative integer.The element that 16PSK letter is concentrated is the element of the code word in conventional formation code book, uses these elements to form code book C _bin code word can be more suitable for practical application.

Preferably, above-mentioned code book C _bcan comprise individual 8 n dimensional vector ns of K, this K 8 n dimensional vector ns are made up of the element that 16PSK letter is concentrated, and the 1st of this K 8 n dimensional vector ns the, the two-dimensional vector of 2 element formations is different; Wherein, K is 2 ^b, B is nonnegative integer.The element that 16PSK letter is concentrated is the element of the code word in conventional formation code book, uses these elements to form code book C _bin code word, can practical application be more suitable for.

After PMI information is sent to transmitting terminal by receiving terminal, transmitting terminal according to this PMI information from code book C _bmiddle acquisition channel quantitative information, and use this channel quantitative information to carry out transmitting precoding.

It is to be noted: to codeword vector or Matrix Multiplication with or divided by a constant, or being multiplied by or not changing divided by a constant character of code word when code word exists multiple row to row wherein, is all the equivalent transformation of above-described embodiment.

In the above-described embodiment, transmitting terminal can be base station, receiving terminal can be subscriber equipment; Transmitting terminal also can be subscriber equipment, receiving terminal also can be base station.

The following examples detail the technical scheme of above-mentioned multiple preferred embodiment.

Summary of the invention

Main purpose of the present invention is the feedback method and the device that provide a kind of channel quantitative information, at least to solve the problem.

According to an aspect of the present invention, provide a kind of feedback method of channel quantitative information, comprising: receiving terminal uses channel related information to carry out process to the first code book and obtains the second code book; The indication information corresponding with the code word in the second code book is sent to transmitting terminal; Wherein, the vector that in the first code book, front X element of each code word is formed is different, and the element in code word meets 8PSK or 16PSK characteristic, n _tfor the number of transmit antennas of transmitting terminal, for the operator that rounds up.

According to a further aspect in the invention, provide a kind of feedback device of channel quantitative information, comprising: processing module, for using channel related information, process is carried out to the first code book and obtain the second code book; Feedback module, for sending the indication information corresponding with the code word in the second code book to transmitting terminal; Wherein, the vector that in the first code book, front X element of each code word is formed is different, and the element in code word meets 8PSK or 16PSK characteristic, n _tfor the number of transmit antennas of transmitting terminal, for the operator that rounds up.By the present invention, by making code book C _bin in each code word before (N _tfor antenna number) vector that forms of individual element is different, thus make the C after by channel related information process effect _bin the similarity degree of code word reduce, code word distance between any two increases, and solves in correlation technique due to code book C _bin some code words distance between any two very little or be the 0 code book C caused _bin the unnecessary waste of some code words, cause the problem that quantitative efficiency is lower, thus reduce code book C _bin the similarity degree of code word, increase code word distance between any two, improve quantitative efficiency.

Accompanying drawing explanation

Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is the flow chart of the feedback method of channel quantitative information according to the embodiment of the present invention;

Fig. 2 is the schematic diagram of the feedback device of channel quantitative information according to the embodiment of the present invention.

Embodiment

Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.

Fig. 1 is the flow chart of the feedback method of channel quantitative information according to the embodiment of the present invention, comprises the following steps:

Step S102, receiving terminal uses channel related information to carry out process to the first code book and obtains the second code book;

Step S104, receiving terminal sends the indication information (i.e. PMI) corresponding with the code word in the second code book to transmitting terminal;

Wherein, the vector that in the first code book, front X element of each code word is formed is different, and the element in code word meets 8PSK or 16PSK characteristic, n _tfor the number of transmit antennas of transmitting terminal, for the operator that rounds up.

Embodiment 1:

In order to make code book C _balso can quantized channel well when not having channel correlation matrix R to rotate, ensure good mode compatibility, and have channel correlation matrix R to code book C _bstill can be ensured by postrotational code word the satisfactory texture adapting to dual polarization channel, code book C during rotation _bin part or all of code word can have following structure: (during Rank1), wherein, u ₁be 4 n dimensional vector ns, a, b are constant.Preferably, u ₁in element be 16PSK letter concentrate element or 0, a, b be 16PSK letter concentrate element or 0.Preferably, u ₁for any column vector in the code word matrix in Rank4 code book in LTE system.Preferably, u ₁for the code word in the Rank1 code book in LTE system.The code word in existing code book can be utilized form the code book C meeting this preferred embodiment and require _b.

Preferably, above-mentioned code book C _bin part or all of code word can have following structure: (during Rank2), wherein, u ₁, u ₂be 4 n dimensional vector ns, a, b, c, d are constant.Preferably, u ₁, u ₂in element be 16PSK letter concentrate element or 0, a, b, c, d be 16PSK letter collection middle element or 0.Preferably, u ₁, u ₂for any column vector in the code word matrix in the Rank4 code book in LTE system; Preferably, u ₁, u ₂for the identical or different code word in the Rank1 code book in LTE system, for unitary matrix, as (can also comprise other equivalent transformation, as antenna number change, often row are multiplied by a constant), works as u ₁, u ₂time orthogonal, can be any 2 × 2 matrixes.The preferred embodiment provides code book C _bin another design feature of code word, some common elements can be utilized to form code book C _bin, make code book C _bthe more realistic application of formation.

Preferably, above-mentioned code book C _bcan comprise individual 8 n dimensional vector ns of K, this K 8 n dimensional vector ns are made up of the element that 8PSK letter is concentrated, and the 1st of this K 8 n dimensional vector ns the, the two-dimensional vector of 2 element formations is different; Wherein, K is 2 ^b, B is nonnegative integer.8PSK

UE obtains the channel correlation matrix R of current channel matrix H and long-time statistical according to pilot tone.UE and base station define an identical code book C _b, this code book C _bcan be: the code book that any one vector in any one vector in any one vector in A1 set, A2 set, any one vector in A3 set and A4 set is formed.

Wherein, A1 set is { W ₀ ^{{ 1}}w ₈ ^{{ 1}}w ₁₂ ^{{ 1}}w ₁₃ ^{{ 1}}, A2 set is { W ₁ ^{{ 1}}w ₉ ^{{ 1}}, A3 set is { W ₂ ^{{ 1}}w ₁₀ ^{{ 1}}w ₁₄ ^{{ 1}}w ₁₅ ^{{ 1}}, A4 set is { W ₃ ^{{ 1}}w ₁₁ ^{{ 1}}.

Such as, C _bfor W ₄ ^{{ 1}}w ₅ ^{{ 1}}w ₆ ^{{ 1}}w ₇ ^{{ 1}}the 2bit code book formed;

C _balso can be W ₀ ^{{ 1}}w ₁ ^{{ 1}}w ₂ ^{{ 1}}w ₃ ^{{ 1}}the 2bit code book formed;

Or, C _bfor W ₀ ^{{ 1}}w ₁ ^{{ 1}}w ₂ ^{{ 1}}w ₃ ^{{ 1}}w ₄ ^{{ 1}}w ₅ ^{{ 1}}w ₆ ^{{ 1}}w ₇ ^{{ 1}}the 3bit code book formed;

C _balso can be W ₄ ^{{ 1}}w ₅ ^{{ 1}}w ₆ ^{{ 1}}w ₇ ^{{ 1}}w ₈ ^{{ 1}}w ₉ ^{{ 1}}w ₁₀ ^{{ 1}}w ₁₁ ^{{ 1}}the 3bit code book formed.

Wherein, i is unit battle array, u _nbased on vector, its concrete value can see table 2, lower with.

UE long period ground feedback R information, make transmitting-receiving two-end jointly instruct the information of R, or base station obtains the R information of long-time statistical according to up-downgoing channel reciprocity.

UE and base station agreement utilize adaptive codebook technology and channel correlation matrix R to code book C _bprocess and obtain adaptive codebook C _b.

For current channel matrix H, UE from adaptive codebook C _bin look for a code word as the quantification to current channel matrix H, and feed back to base station with the form of PMI.Base station according to this PMI from adaptive codebook C _bin find and characterize the codeword vector of channel information, and use this codeword vector to carry out precoding to the data that will send.

Embodiment 2:

UE end obtains the channel correlation matrix R of current channel matrix H and long-time statistical according to pilot tone.

UE end and base station end define an identical code book C _b.This code book C _bcan be:

the code book of 16 vector compositions.

Also can be:

a code book of composition.

Can also be:

a code book of composition.

UE long period ground feedback R information, make transmitting-receiving two-end jointly know the information of R, or base station obtains the R information of long-time statistical according to up-downgoing channel reciprocity.

UE and base station agreement utilize adaptive codebook technology and channel correlation matrix R to code book C _bprocess and obtain adaptive codebook C _b.

For current channel matrix H, UE is from C _bin look for a code word as the quantification to current channel matrix H, and feed back to base station with the form of PMI.Base station according to PMI from code book C _bin find and characterize the codeword vector of channel information, and use this codeword vector to carry out precoding.

Embodiment 3

UE obtains the channel correlation matrix R of current channel matrix H and long-time statistical according to pilot tone.

UE and base station define an identical code book C _b.This code book C _bcan be:

the code book of 16 vector compositions;

Also can be:

a code book of composition;

Also can be:

a code book of composition;

Can also be:

a code book of composition.

UE long period ground feedback R information, make transmitting-receiving two-end jointly instruct the information of R, or base station obtains the R information of long-time statistical according to up-downgoing channel reciprocity.

UE and base station agreement utilize existing adaptive codebook technology to utilize channel correlation matrix to code book C _bprocess and obtain adaptive codebook C _b.

For current channel matrix H, UE from adaptive codebook C _bin look for a code word as the quantification to current channel matrix H, and feed back to base station with the form of PMI.Base station according to PMI from adaptive codebook C _bin find and characterize the codeword vector of channel information, and use this codeword vector to carry out precoding.

Embodiment 4

UE obtains the channel correlation matrix R of current channel matrix H and long-time statistical according to pilot tone.

UE and base station define an identical code book C _b.Partial codeword in this code book is:

wherein, a, b are the alphabetical concentrated element of 16PSK or are 0.

Above-mentioned 16PSK letter collection is following 16 elements lower same.

UE and base station define an identical code book C _b.This code book C _bin partial codeword be:

$\left[\begin{array}{c}{\mathrm{aW}}_8^{\left\{1\right\}}\\ {\mathrm{bW}}_8^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{\mathrm{aW}}_9^{\left\{1\right\}}\\ {\mathrm{bW}}_9^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{\mathrm{aW}}_{10}^{\left\{1\right\}}\\ {\mathrm{bW}}_{10}^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{\mathrm{aW}}_{11}^{\left\{1\right\}}\\ {\mathrm{bW}}_{11}^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{\mathrm{aW}}_{12}^{\left\{1\right\}}\\ {\mathrm{bW}}_{12}^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{\mathrm{aW}}_{13}^{\left\{1\right\}}\\ {\mathrm{bW}}_{13}^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{\mathrm{aW}}_{14}^{\left\{1\right\}}\\ {\mathrm{bW}}_{14}^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{\mathrm{aW}}_{15}^{\left\{1\right\}}\\ {\mathrm{bW}}_{15}^{\left\{1\right\}}\end{array}\right];$

This code book C _bin partial codeword also can be:

$\left[\begin{array}{c}{a}_1{W}_0^{\left\{1\right\}}\\ b_1{W}_0^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{a}_1{W}_1^{\left\{1\right\}}\\ b_1{W}_1^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{a}_1{W}_2^{\left\{1\right\}}\\ b_1{W}_2^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{a}_1{W}_3^{\left\{1\right\}}\\ b_1{W}_3^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{a}_1{W}_4^{\left\{1\right\}}\\ b_1{W}_4^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{a}_1{W}_5^{\left\{1\right\}}\\ b_1{W}_5^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{a}_1{W}_6^{\left\{1\right\}}\\ b_1{W}_6^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{a}_1{W}_7^{\left\{1\right\}}\\ b_1{W}_7^{\left\{1\right\}}\end{array}\right],$

$\left[\begin{array}{c}{a}_2{W}_0^{\left\{1\right\}}\\ b_2{W}_0^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{a}_2{W}_1^{\left\{1\right\}}\\ b_2{W}_1^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{a}_2{W}_2^{\left\{1\right\}}\\ b_2{W}_2^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{a}_2{W}_3^{\left\{1\right\}}\\ b_2{W}_3^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{a}_2{W}_4^{\left\{1\right\}}\\ b_2{W}_4^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{a}_2{W}_5^{\left\{1\right\}}\\ b_2{W}_5^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{a}_2{W}_6^{\left\{1\right\}}\\ b_2{W}_6^{\left\{1\right\}}\end{array}\right]\left[\begin{array}{c}{a}_2{W}_7^{\left\{1\right\}}\\ b_2{W}_7^{\left\{1\right\}}\end{array}\right],$

Wherein, a is had at least ₁≠ a ₂or b ₁≠ b ₂, a ₁, a ₂, b ₁, b ₂for element or be 0 concentrated in 16PSK letter.

Above code word is the code word of the dual polarized antenna channel adapting to main flow, owing to often wishing to contain various situation, C with a code book in the communication technology _bin other code word can according to precision need and need consider channel specific features suitably increase.

UE long period ground feedback R information, make transmitting-receiving two-end jointly instruct the information of R, or base station obtains the R information of long-time statistical according to up-downgoing channel reciprocity.

UE and base station agreement utilize adaptive codebook technology and channel correlation matrix R to code book C _bprocess and obtain adaptive codebook C _b.

For current channel matrix H, UE from adaptive codebook C _bin look for a code word as the quantification to current channel matrix H, and feed back to base station with the form of PMI.Base station according to PMI from adaptive codebook C _bin find and characterize the codeword vector of channel information, and use this codeword vector to carry out precoding.

Embodiment 5

UE obtains the channel correlation matrix R of current channel matrix H and long-time statistical according to pilot tone.

UE and base station define an identical code book C _b.This code book C _bin partial codeword be:

wherein, a, b, c, d are the alphabetical concentrated element of 16PSK or are 0.

Concrete, can be a=1, b=1, c=1, d=-1, or a=1, b=-1, c=1, d=1, or a=1, b=0, c=0, d=1.

Or, this code book C _bin partial codeword be:

wherein, a, b, c, d are the alphabetical concentrated element of 16PSK or are 0.

Concrete, can be a=1, b=1, c=1, d=-1, or a=1, b=-1, c=1, d=1, or a=1, b=0, c=0, d=1.

Above code book C _bin code word be the code word of dual polarized antenna channel adapting to main flow, owing to often wishing to contain various situation, C with a code book in the communication technology _bin other code word can according to precision need or need consider channel specific features suitably increase.

UE long period ground feedback R information, make transmitting-receiving two-end jointly instruct the information of R, or base station obtains the R information of long-time statistical according to up-downgoing channel reciprocity.

UE and base station agreement utilize adaptive codebook technology and channel correlation matrix R to code book C _bprocess and obtain adaptive codebook C _b.

And for current channel matrix H, UE from adaptive codebook C _bin look for a code word as the quantification to current channel matrix H, and feed back to base station with the form of PMI.Base station according to PMI from adaptive codebook C _bin find and characterize the codeword vector of channel information, and use this codeword vector to carry out precoding.

Embodiment 6

UE obtains the channel correlation matrix R of current channel matrix H and long-time statistical according to pilot tone.

UE and base station define an identical code book C _b.This code book C _bin partial codeword can be:

wherein, a, b, c, d are the alphabetical concentrated element of 16PSK or are 0.

Concrete, can be a=1, b=1, c=1, d=-1, or a=1, b=-1, c=1, d=1, or a=1, b=0, c=0, d=1, or other Arbitrary Matrix.

Or, this code book C _bin partial codeword be:

wherein, a, b, c, d are the alphabetical concentrated element of 16PSK or are 0.

Concrete, can be a=1, b=1, c=1, d=-1, or a=1, b=-1, c=1, d=1, or a=1, b=0, c=0, d=1.

Above code word is the code word of the dual polarized antenna channel adapting to main flow, owing to often wishing to contain various situation, C with a code book in the communication technology _bin other code word can according to precision need or need consider channel specific features suitably increase.

UE macrocyclic feedback R information, makes sending and receiving end jointly instruct the information of R, or base station obtains the R information of long-time statistical according to up-downgoing channel reciprocity.

UE and base station agreement utilize adaptive codebook technology and channel correlation matrix to code book C _bprocess and obtain adaptive codebook C _b.

For current channel matrix H, UE from adaptive codebook C _bin look for a code word as the quantification to current channel matrix H, and feed back to base station with the form of PMI.Base station according to PMI from adaptive codebook C _bin find and characterize the codeword vector of channel information, and use this codeword vector to carry out precoding.

Fig. 2 is the schematic diagram of the feedback device of channel quantitative information according to the embodiment of the present invention, comprising:

Processing module 10, carries out process for using channel related information to the first code book and obtains the second code book;

Feedback module 20, for sending the indication information corresponding with the code word in the second code book to transmitting terminal;

Wherein, the vector that in the first code book, front X element of each code word is formed is different, and the element in code word meets 8PSK or 16PSK characteristic, n _tfor the number of transmit antennas of transmitting terminal, for the operator that rounds up.

Wherein, meet 8PSK characteristic or 16PSK characteristic, namely all elements wherein such as vector, matrix, code word is all the element that 8PSK or 16PSK letter is concentrated.

Above-mentioned first code book (i.e. code book C _b) there is code book C in the embodiment of the feedback method of above-mentioned channel quantitative information _bfeature.The matrix that above-mentioned processing module 10 uses can have the feature of the matrix in the embodiment of the feedback method of above-mentioned channel quantitative information.

Wherein, the feedback device of this channel quantitative information can be base station or subscriber equipment.

As can be seen from the above description, present invention achieves following technique effect: code book C _bnot only there is the feature that overall vector is different, but also have before in each code word (N _tfor antenna number) the different feature of the vector that forms of individual element, the code book C after by channel related information process can be made _bdistributed more reasonable in the quantification space compressed, thus more effectively quantized channel information, improves quantitative efficiency.

Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (18)

1. a feedback method for channel quantitative information, described feedback method is applied to Long Term Evolution LTE system, it is characterized in that, comprising:

Receiving terminal uses channel related information to carry out process to the first code book and obtains the second code book;

The indication information corresponding with the code word in described second code book is sent to transmitting terminal;

Wherein, the vector that in described first code book, front X element of each code word is formed is different, and the element in described code word meets 8PSK or 16PSK characteristic, n _tfor the number of transmit antennas of described transmitting terminal, for the operator that rounds up;

Wherein, described transmitting terminal finds the code word corresponding with described indication information in described second code book, and uses described code word to carry out precoding.

2. method according to claim 1, is characterized in that, as described number of transmit antennas N _twhen being 4,

Code word in described first code book comprises K 4 n dimensional vector ns, and individual 4 n dimensional vector ns of described K are concentrated by 16PSK letter or the alphabetical concentrated element of 8PSK is formed, wherein, and K=2 ^b, B is nonnegative integer; Or the code word in described first code book comprises the partial codeword in layer 1 code book,

The two-dimensional vector that 1st element of described code word and the 2nd element are formed is different.

3. method according to claim 1, is characterized in that, as described number of transmit antennas N _twhen being 4, the code word in described first code book comprises a vector in a vector in a vector in A1 set, A2 set, A3 set in a vector and A4 set, wherein, described A1 set is described A2 set is described A3 set is described A4 set is i is unit matrix, u _nbased on vector, n=0,1 ..., 15.

4. method according to claim 3, is characterized in that, the code word in described first code book comprises M vector, a described M vector be selected from by the set of vectors of a vector composition during a vector during a vector during a vector in described A1 set, described A2 gather, described A3 gather and described A4 gather, wherein 0<M<8.

5. method according to claim 1, is characterized in that, as described number of transmit antennas N _twhen being 8,

Code word in described first code book comprises K 8 n dimensional vector ns, and described K 8 n dimensional vector ns are made up of the element that 16PSK letter is concentrated, wherein, and K=2 ^b, B is nonnegative integer;

The 1st, 2,3 of described code word, 4 n dimensional vector ns of 4 element formations are different, or the trivector that the 1st, 2,3 elements of described code word are formed is different; Or the 1st of described code word, the two-dimensional vector of 2 element formations is different.

6. method according to claim 1, is characterized in that, as described number of transmit antennas N _twhen being 8,

Code word in described first code book comprises K 8 n dimensional vector ns, and described K 8 n dimensional vector ns are made up of the element that 8PSK letter is concentrated, wherein, and K=2 ^b, B is nonnegative integer;

The two-dimensional vector that 1st element of described code word and the 2nd element are formed is different.

7. method according to claim 1, is characterized in that, as described number of transmit antennas N _tbe 8, the number of plies is when being 1, the part or all of code word in described first code book has $\left[\begin{array}{c}{\mathrm{au}}_1\\ {\mathrm{bu}}_1\end{array}\right]$ Structure, wherein, u ₁be 4 n dimensional vector ns, a, b are constant.

8. method according to claim 7, is characterized in that, described u ₁in element be 16PSK letter concentrate element or 0, described a, b be 16PSK letter concentrate element or 0.

9. method according to claim 7, is characterized in that, described u ₁for the column vector in the code word in layer 4 code book, or, described u ₁for the code word in layer 1 code book.

10. method according to claim 1, is characterized in that, as described number of transmit antennas N _tbe 8, the number of plies is when being 2, the part or all of code word in described first code book has $\left[\begin{array}{cc}{\mathrm{au}}_1& {\mathrm{cu}}_2\\ {\mathrm{bu}}_1& {\mathrm{du}}_2\end{array}\right]$ Structure, wherein u ₁, u ₂be 4 n dimensional vector ns, a, b, c, d are constant.

11. methods according to claim 10, is characterized in that, described u ₁, u ₂in element be 16PSK letter concentrate element or 0, described a, b, c, d be 16PSK letter concentrate element or 0.

12. methods according to claim 10, is characterized in that, described u ₁, u ₂for the column vector in the code word in layer 4 code book.

13. methods according to claim 10, is characterized in that, described u ₁, u ₂for the code word in layer 1 code book, $\left[\begin{array}{cc}a& c\\ b& d\end{array}\right]$ For unitary matrix, and work as u ₁, u ₂time orthogonal, described in $\left[\begin{array}{cc}a& c\\ b& d\end{array}\right]$ Be 2 × 2 matrixes.

14. methods according to claim 1, is characterized in that, described channel related information is N _t× N _tmatrix.

15. methods according to claim 1, is characterized in that, described channel related information is channel correlation matrix R.

16. methods according to claim 15, is characterized in that, described channel correlation matrix R is a matrix in block form.

17. methods according to claim 1, is characterized in that, described channel related information is that the form of multiple matrix represents.

The feedback device of 18. 1 kinds of channel quantitative informations, described feedback device is applied to Long Term Evolution LTE system, it is characterized in that, comprising:

Processing module, carries out process for using channel related information to the first code book and obtains the second code book;

Feedback module, for sending the indication information corresponding with the code word in described second code book to transmitting terminal;

Wherein, the vector that in described first code book, front X element of each code word is formed is different, and the element in described code word meets 8PSK or 16PSK characteristic, n _tfor the number of transmit antennas of described transmitting terminal, for the operator that rounds up; Wherein, described transmitting terminal finds the code word corresponding with described indication information in described second code book, and uses described code word to carry out precoding.